单项选择题

The best title of the passage might be ______.

A．Social Security Benefits in the United States
B．Aging Process Controlled
C．Ideal Living Conditions
D．Man's Possible Life Span
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单项选择题
Which of the following statements is TRUE according to the passage
A．If a man receives Social Security benefits, he can live longer than 100 years.
B．If someone lives over 100 years, he can still receive Social Security benefits.
C．It takes a person 20 years to become full grown.
D．Living with an animal is the ideal condition for having a long life.
单项选择题
The underlined part of the first sentence Doctors are of the opinion that' means ______.
A．"Doctors are against that '""
B．"Doctors declare that "'"
C．"Doctors think that'""
D．"Doctors find that'""
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